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The ECU uses vehicle speed, RPM and MAF voltage to do a variety of things, mainly in-gear rev limit, speed limit, OL and CL fueling and also to put itself into the "upper gear" fuel/timing maps (Nistune). Put it this way, if it didn't need this input from factory, it wouldn't be there. I'd recommend keeping it, but that's just my $0.02
As for the MIL, the ECU can and does trigger the MIL under very few, and rare circumstances. Does this really matter? Not 100%, however I'd still recommend getting it working as it can do a lot of things more easily, like check code blinks, OR, if you use a stand-alone, you can select to use the MIL as a knock light, among other things, which is really handy.
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1990 NISSAN 240SX
1990 NISSAN 300ZX
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